An Invoice that contains a VAT breakdown group (BG-23) with a VAT category code (BT-118) "Not subject to VAT" shall not contain Document level allowances (BG-20) where Document level allowance VAT category code (BT-95) is not "Not subject to VAT".
Explanation
When the invoice has a 'not subject to VAT' breakdown, document-level allowances must not use a different VAT category.
How to fix
Align allowances with 'not subject to VAT' or change them.